Sofa



1.1 : Perspective

1.2 : Right

1.3 : Front

1.4 : Left

1.5 : Top

1.6 : Back

1.7 : Bottom

The broken lines shown in the drawings illustrate portions of the article that form no part of the claimed design. 

CLAIM I claim the ornamental design for a sofa, as shown and described herein. 